Things change in the blink of an eye in football. The Football Whispers Index takes the latest transfer rumours and gives them a score out of five; the higher the score, the more realistic and reliable the Whisper.

Here are today's top five emerging whispers. And keep an eye on Transfer Talk for all the latest gossip.

Matthijs de Ligt to Manchester City

Ajax centre-back de Ligt has been identified by Pep Guardiola as a long-term replacement for skipper Vincent Kompany, according to The Guardian. The 18-year-old is highly rated -- as well as being a Manchester City target, De Ligt has been widely linked with several other big clubs in Europe, notably Tottenham and Barcelona.

Alvaro Morata to AC Milan

Sky Sports Italia are reporting that Milan are after the Chelsea striker, who missed out on making Spain's World Cup squad. The Italian club were heavily linked to Morata last summer, and it is no surprise they have renewed their interest after the Spaniard's underwhelming debut season at Chelsea. Morata has also been linked to a return to Juventus after scoring just 11 Premier League goals for Antonio Conte's side.

Kalidou Koulibaly to Manchester United

Wanted by Arsenal and Chelsea, Tuttosport are reporting that Koulibaly is now also a Manchester United target. They will have to pay a hefty sum to sign the Napoli centre-back though, with the Serie A runners-up wanting around £85 million. If this is indeed the amount Koulibaly moves for, it will be a big return on Napoli's initial investment -- they bought him for just £7m in 2014 from Genk.

Salomon Rondon to West Ham United

West Brom's relegation means they need to trim their squad and the Mirror are reporting that West Ham have joined the race to sign Rondon. The Venezuelan forward has a £16m price tag, according to the report, and is also a Cardiff City target after their promotion to the Premier League.

Danny Welbeck to Besiktas

Not only have Welbeck's performances for Arsenal in the final months of the season earned him a spot in England's World Cup squad, but they have also attracted the eye of Besiktas. Turkish outlet Fotospor are reporting the striker has been identified as a possible replacement for Brazilian forward Talisca, who will be returning to Benfica after a two-year loan spell in Turkey.